The impact of much higher production combined with static demand during this fourth uranium age is substantial over-supply in the world uranium market, with prices naturally falling back to lower levels.nly part of the 2.5 million tonnes of uranium mined since 1945 has been utilised. Almost 2 million tonnes of depleted uranium is an attractive resource while there is overcapacity in enrichment and cheaper prices.
Inside the Torso. The body's functions are conducted by organs. Each organ is a recognizable structure (for example, the heart, lungs, liver, eyes, and stomach) that performs specific functions. An organ is made of several types of tissue and therefore several types of cells (see Cells). For example, the heart (see Heart) contains muscle tissue that contracts to pump blood, fibrous tissue that makes up the heart valves, and special cells that maintain the rate and rhythm of heartbeats.
Biological Heart Valves. Biological Heart Valves are made of tissues and valves derived from animals or human donors. Their biggest advantage is that they do not cause blood clotting on their surface and truly replicate the form and function of the normal human valve.